QUEMESA Topmenu / Sprachen

QUEMESA

11 megapixel bottom-mounted TEM camera

The QUEMESA provides everything expected of a high end TEM CCD camera today: the extremely high resolution, very high sensitivity, superior contrast, high frame rates, and a large field of view. These superior properties make the QUEMESA the ideal choice both for biomedical and materials science applications. The most satisfying aspect of this CCD TEM camera is that the TEM itself is now the only limiting factor with regard to resolution and sensitivity for most current TEM applications — no longer the camera.

High sensitivity and contrast at optimal resolution are the requisite ultimate goals for any TEM camera system. Every single photon generated in the scintillator per incident electron is of importance. The camera scintillator needs to be optimized to achieve the maximum signal from the pear shaped interaction volume. This is done by matching the effective pixel size through optimization of scintillator thickness. The QUEMESA camera system does this perfectly. Bringing scintillator thickness and pixel size into ideal correlation with one another ensures the maximum number of photons is detected. This guarantees an outstanding image.

The 2:1 fiber optical taper provides the highest quality. This increases the effective pixel size to 18 µm x 18 µm. In combination with the optimized scintillator thickness, this ensures optimal resolution and sensitivity. The taper provides a further benefit — an extremely large field of view for a bottom mounted TEM CCD camera. Its dimensions are almost comparable to the photo plate size of most current TEMs.

The QUEMESAs fast single port read out supports high frame rates of more than 12 fps, making it much more convenient to scan and focus on the PC monitor. The use of single port readout ensures a homogeneous CCD response over the whole readout area. Even when in the highest quality mode (full resolution) the camera provides more than 2 fps. This camera provides superb dynamic range and sensitivity no matter which resolution mode is employed. Due to highly efficient conversion of primary electrons in the scintillator and optimized electronics design, the QUEMESA system gains a near perfect signal-to-noise ratio, resulting in very high sensitivity. This enables you to view your samples on your monitor at beam intensities so low it would normally prevent seeing an image on the TEM viewing screen. The finest detail is still shown perfectly in the camera image.

 

Download here the QUEMESA brochure.

Quemesa, 11 megapixel bottom-mounted TEM camera
Quemesa, 11 megapixel bottom-mounted TEM camera
Myelin, 13000x
Myelin, 13000x

APPLICATIONS

Life and Materials Sciences

Diffraction

Low Dose Imaging

Virology

Digital documentation

Specifications:

Chip type

interline CCD sensor

Resolution

4008 x 2664 pixels

Binning 2x

2004 x 1332 pixels

Pixel size

9 µm x 9 µm

Effective pixel size

18 µm x 18 µm

Binning

2x, 3x, 4x

Pixel clock rate (MHz)

25 / 50 MHz

Frame rate @ full resolution

> 2 frames per second (HQ)

Frame rate @ binning

> 12 frames per second (fps)

Digitization

14 bit

Exposure time

1 ms – 100 s

Cooling

20°C @ 25°C ambient temperature

Mounting position

bottom port (on axis)

Anti blooming

> 100x

PC interface

FireWire – IEEE1394a

Optical coupling

fibre optics (2:1)

Partial readout

yes

Full well capacity

> 60,000 e-

Operating system/ Imaging software

Windows 7 – 64 bit / RADIUS 1.4